Identifying AGN Balmer absorptions and stratified narrow emission-line region kinematics in SDSS J112611.63+425246.4

Wang, J.; Xu, D.

doi:10.1051/0004-6361/201424848

Cited by 9 publications

(7 citation statements)

References 40 publications

(48 reference statements)

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“…The latter has been seen in other studies of AGNs (e.g. Wang & Xu 2015;Zhang et al 2015). However, for many other previous detections of Hβ absorption in AGNs, the corresponding Hα absorption was also not detected (e.g Hutchings et al 2002), and is most likely due to the dominance of the strong Hα in emission.…”

Section: Simultaneous Fit With Hαsupporting

confidence: 51%

“…Kleiser et al 2011). Detections of Hβ absorption have also been reported in a dozen of Seyferts and QSOs spectra (e.g Hutchings et al 2002;Hall et al 2002;Aoki et al 2006;Hall 2007;Wang et al 2008;Aoki 2010;Shapovalova et al 2010;Ji et al 2012Ji et al , 2013Wang & Xu 2015;Zhang et al 2015;Shi et al 2016) and are generally interpreted in terms of absorption by dense clouds, possibly associated with BLR clouds along the line of sight (which are indeed expected to have densities of about 10 11 cm −3 and temperatures of ∼ 10 4 K), although some of these authors have modelled these absorptions on scales slightly larger than the BLR.…”

Section: Broad Balmer Absorption: Evidence For An Ultra-dense Outflowmentioning

confidence: 99%

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An ultra-dense fast outflow in a quasar at z = 2.4

Williams¹,

Maiolino²,

Krongold³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present Adaptive Optics assisted near-IR integral field spectroscopic observations of a luminous quasar at z = 2.4, previously observed as the first known example at high redshift of large scale quasar-driven outflow quenching star formation in its host galaxy. The nuclear spectrum shows broad and blueshifted Hβ in absorption, which is tracing outflowing gas with high densities (> 10 8 -10 9 cm −3 ) and velocities in excess of 10,000 km s −1 . The properties of the outflowing clouds (covering factor, density, column density and inferred location) indicate that they likely originate from the Broad Line Region. The energetics of such nuclear regions is consistent with that observed in the large scale outflow, supporting models in which quasar driven outflows originate from the nuclear region and are energy conserving. We note that the asymmetric profile of both the Hβ and Hα emission lines is likely due to absorption by the dense outflowing gas along the line of sight. This outflow-induced asymmetry has implications on the estimation of the black hole mass using virial estimators, and warns about such effects for several other quasars characterized by similar line asymmetries. More generally, our findings may suggest a broader revision of the decomposition and interpretation of quasar spectral features, in order to take into account the presence of potential broad blueshifted Balmer absorption lines. Our high spatial resolution data also reveal redshifted nebular emission lines, which could be potentially tracing an inflowing stream.

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Section: Simultaneous Fit With Hαsupporting

confidence: 51%

Section: Broad Balmer Absorption: Evidence For An Ultra-dense Outflowmentioning

confidence: 99%

An ultra-dense fast outflow in a quasar at z = 2.4

Williams¹,

Maiolino²,

Krongold³

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…Currently, the rarest case of absorption features in BALs is absorption in their Balmer lines, with only 11 cases reported to date, of which only two are known at z > 1.0 (Hutchings et al 2002;Hall et al 2002;Aoki et al 2006;Hall 2007;Wang et al 2008;Aoki 2010;Ji et al 2012Ji et al , 2013Wang & Xu 2015;Zhang et al 2015;Mudd et al 2017). The existence of Balmer absorption requires a high number density of n = 2 level hydrogen atoms, which might be caused by Lyα trapping (Hall 2007).…”

Section: Introductionmentioning

confidence: 99%

Discovery of Strong Balmer Line Absorption in Two Luminous LoBAL Quasars at z ∼ 1.5

Schulze

Misawa

Zuo

et al. 2018

ApJ

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We present the discovery of strong Balmer line absorption in Hα to Hγ in two luminous lowionization broad absorption line quasars (LoBAL QSOs) at z ∼ 1.5, with black hole masses around 10 10 M ⊙ from near-IR spectroscopy. There are only two previously known quasars at z > 1.0 showing Balmer line absorption. SDSS J1019+0225 shows blueshifted absorption by ∼ 1400 km s −1 with an Hα rest-frame equivalent width of 13Å. In SDSS J0859+4239 we find redshifted absorption by ∼ 500 km s −1 with an Hα rest-frame equivalent width of 7Å. The redshifted absorption could indicate an inflow of high density gas onto the black hole, though we cannot rule out alternative interpretations. The Balmer line absorption in both objects appears to be saturated, indicating partial coverage of the background source by the absorber. We estimate the covering fractions and optical depth of the absorber and derive neutral hydrogen column densities, N H I ∼ 1.3 × 10 18 cm −2 for SDSS J1019+0225 and N H I ∼ 9×10 17 cm −2 for SDSS J0859+4239 . In addition, the optical spectra reveal also absorption troughs in He I * λ3889 and λ3189 in both objects.

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“…This is usually interpreted as an indicator of an AGN-driven outflow with high hydrogen column densities (e.g. Hutchings et al 2002;Aoki 2010;Wang & Xu 2015). These absorption features bear some resemblance to P Cygni profiles, similar to what was seen in the galaxy PHL 293B.…”

Section: Sdss J1025: Balmer Absorption Linementioning

confidence: 64%

“…Following Wang & Xu (2015), we estimate the neutral hydrogen column density in the optically thin regime using the equation,…”

Section: Sdss J1025: Balmer Absorption Linementioning

confidence: 99%

On the AGN Nature of Broad Balmer Emission in Four Low-Redshift Metal-Poor Galaxies

Burke,

Liu,

Chen

et al. 2020

Preprint

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We report on continued, ∼15 year-long, broad Balmer emission lines in three metal-poor dwarf emission-line galaxies selected from Sloan Digital Sky Survey spectroscopy. The persistent luminosity of the broad Balmer emission indicates the galaxies are active galactic nuclei (AGNs) with virial black hole masses of 10 6.4 −10 6.7 M ⊙ . The lack of observed hard X-ray emission and the possibility that the Balmer emission could be due to a long-lived stellar transient motivated additional follow-up spectroscopy. We also identify a previously-unreported blueshifted narrow absorption line in the broad Hα feature in one of the AGNs, indicating an AGN-driven outflow with hydrogen column densities of order 10 17 cm −2 . We also extract light curves from the Catalina Real-Time Transient Survey, Pan-STARRS, and the Zwicky Transient Facility. We detect AGN-like variability in three galaxies, further supporting the AGN scenario. This also suggests the AGNs are not strongly obscured. This sample of galaxies are among the most metal-poor which host an AGN (Z = 0.05 -0.16 Z ⊙ ). We speculate they may be analogues to seed black holes which formed in unevolved galaxies at high redshift. Given the rarity of metal-poor AGNs and small sample size available, we investigate prospects for their identification in future spectroscopic and photometric surveys.

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Identifying AGN Balmer absorptions and stratified narrow emission-line region kinematics in SDSS J112611.63+425246.4

Cited by 9 publications

References 40 publications

An ultra-dense fast outflow in a quasar at z = 2.4

An ultra-dense fast outflow in a quasar at z = 2.4

Discovery of Strong Balmer Line Absorption in Two Luminous LoBAL Quasars at z ∼ 1.5

On the AGN Nature of Broad Balmer Emission in Four Low-Redshift Metal-Poor Galaxies

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